Evo 1654 add modal keyboard events handling

[KevinTriplett]

fixes #1654

Problems:

• "prev arrow" icon of image carousel was off screen / clipped
• image carousel did not respond to left arrow and right arrow keyboard action
• modal did not respond to escape and return keyboard action
• clicking outside the modal did not dismiss the modal, an expected action for most users

Three commits:

• fix position of "prev arrow" on image carousel
• enable modal keyboard and mouse events
  • previously, only the background DOM received events
  • escape now cancels the modal
  • return now submits the modal (NOTE: if no submit action, just closes modal)
  • clicking anywhere outside the modal cancels it
• enable image carousel keyboard events
  • previously, only the background DOM received events
  • after above modal commit, slick-slide in image carousel still did not receive keyboard events
  • NOTE: only way to trigger slick-slide without a ref is to trigger mouse events on the arrow buttons

Best I could do quickly -- may have been a cleaner way to do it but eh

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 72.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 47.23%. Comparing base (9a96a7a) to head (757ca1f). Report is 32 commits behind head on dev.

Files	Patch %	Lines
src/components/ImageCarousel/ImageCarousel.js	69.23%	4 Missing :warning:
src/components/ModalDialog/ModalDialog.js	75.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #1657 +/- ## ========================================== + Coverage 47.17% 47.23% +0.05% ========================================== Files 575 575 Lines 13723 13748 +25 Branches 3958 3964 +6 ========================================== + Hits 6474 6494 +20 - Misses 7249 7254 +5 ```

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[KevinTriplett]

I'm looking at tests I can add to improve coverage and catch future regressions